Hydrogen retention in lithium and lithium oxide films

JOURNAL OF NUCLEAR MATERIALS

卷:502

Article

Buzi, L.¹  Yang, Y.¹  Dominguez-Gutierrez, F. J.²  Nelson, A. O.³  Hofman, M.⁴  Krstic, P. S.²  Kaita, R.³  Koel, B. E.¹ 

[1] Princeton Univ, Dept Chem & Biol Engn, Princeton, NJ 08544 USA

[2] SUNY Stony Brook, Inst Adv Computat Sci, Stony Brook, NY 11794 USA

[3] Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA

[4] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

关键词: Hydrogen retention;    Lithium;    Lithium oxide;    Nickel single crystal;    Molecular dynamics;   

DOI  :  10.1016/j.jnucmat.2018.02.010

来源: Elsevier

【 摘 要 】

Pure lithium (Li) surfaces are difficult to maintain in fusion devices due to rapid oxide formation, therefore, parameterizing and understanding the mechanisms of hydrogen (H, D) retention in lithium oxide (Li2O) in addition to pure Li is crucial for Li plasma-facing material applications. To compare H retention in Li and Li2O films, measurements were made as a function of surface temperature (90-520 K) under ultrahigh vacuum (UHV) conditions using temperature programmed desorption (TPD). In both cases, the total retention dropped with surface temperature, from 95% at 90 K to 35% at 520 K Li2O films retained H in similar amounts as pure Li. Molecular Dynamics (MD) modeling was used to elucidate the mechanisms of H retention, and results were consistent with experiments in terms of both retention fraction and the drop of retention with temperature. (c) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

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